cdf
Computes the cumulative distribution function at x using the piecewise quadratic CDF.
Returns (x - a)^2 / ((b - a)(c - a)) for a < x <= c and 1 - (b - x)^2 / ((b - a)(b - c)) for c < x < b.
Return
the probability that a value drawn from this distribution is less than or equal to x.
Parameters
x
the point at which to evaluate the cumulative probability.